句柄
下图为OCI的全部句柄，但并不是所有的句柄我们都已实现，只是实现了部分，最后一列标出了是否已经实现：
| 描述 | 结构体 | 句柄标识 | 是否实现 |
|---|---|---|---|
| OCI environment handle | OCIEnv | OCI_HTYPE_ENV | 是 |
| OCI error handle | OCIError | OCI_HTYPE_ERROR | 是 |
| OCI service context handle | OCISvcCtx | OCI_HTYPE_SVCCTX | 是 |
| OCI statement handle | OCIStmt | OCI_HTYPE_STMT | 是 |
| OCI bind handle | OCIBind | OCI_HTYPE_BIND | 是 |
| OCI define handle | OCIDefine | OCI_HTYPE_DEFINE | 是 |
| OCI describe handle | OCIDescribe | OCI_HTYPE_DESCRIBE | 否 |
| OCI server handle | OCIServer | OCI_HTYPE_SERVER | 是 |
| OCI user session handle | OCISession | OCI_HTYPE_SESSION | 是 |
| OCI authentication information handle | OCIAuthInfo | OCI_HTYPE_AUTHINFO | 否 |
| OCI connection pool handle | OCICPool | OCI_HTYPE_CPOOL | 否 |
| OCI session pool handle | OCISPool | OCI_HTYPE_SPOOL | 否 |
| OCI transaction handle | OCITrans | OCI_HTYPE_TRANS | 是 |
| OCI complex object retrieval (COR) handle | OCIComplexObject | OCI_HTYPE_COMPLEXOBJECT | 否 |
| OCI thread handle | OCIThreadHandle | Not applicable | 否 |
| OCI subscription handle | OCISubscription | OCI_HTYPE_SUBSCRIPTION | 否 |
| OCI direct path context handle | OCIDirPathCtx | OCI_HTYPE_DIRPATH_CTX | 否 |
| OCI direct path function context handle | OCIDirPathFuncCtx | OCI_HTYPE_DIRPATH_FN_CTX | 否 |
| OCI direct path column array handle | OCIDirPathColArray | OCI_HTYPE_DIRPATH_COLUMN_ARRAY | 否 |
| OCI direct path stream handle | OCIDirPathStream | OCI_HTYPE_DIRPATH_STREAM | 否 |
| OCI process handle | OCIProcess | OCI_HTYPE_PROC | 否 |
| OCI administration handle | OCIAdmin | OCI_HTYPE_ADMIN | 否 |
| OCI HA event handle | OCIEvent | Not applicable | 否 |
| OCI SODA collection handle | OCISodaColl | OCI_HTYPE_SODA_COLLECTION | 否 |
| OCI SODA collection cursor handle | OCISodaCollCursor | OCI_HTYPE_SODA_CURSOR | 否 |
| OCI SODA document cursor handle | OCISodaDocCursor | OCI_HTYPE_SODA_DOC_CURSOR | 否 |
| OCI SODA document handle | OCISodaDoc | OCI_HTYPE_SODA_DOCUMENT | 否 |
| OCI SODA output options handle | OCISodaOutputOptions | OCI_HTYPE_SODA_OUTPUT_OPTIONS | 否 |
| OCI SODA operation options handle | OCISodaOperationOptions | OCI_HTYPE_SODA_OPER_OPTIONS | 否 |
